what is resonance?
Please explain what is transformer and tell what is the reason behind the working of transformer that it reduces potenial when current is high and increases potential when current is low?
Explain widely and deeply with concepts.
Transformer is a device based on mutual inductance and is used to change the voltage of alternating (or varying) current. There are two types of transformers – stepup and stepdown.
A step-up transformer increases the voltage as the step-down transformer decreases the ac voltage.
When a transformer changes the alternating voltage, it is not adding any power, it only transforms the voltage.
As power is the product of voltage and current, as voltage increases, the current decreases. (and vice versa)
The following links will help you understand transformers in great detail.
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12 cells,each of emf 1.5V and internal resistance, are arranged in ‘m’ rows each containing ‘n’ cells connected in series.calculate the values of ‘n’ and ‘m’ for which this combination would send maximum current through an external resistance of 1.5ohm.
We say current flow opposite to electron flow but what is current?
Electric current is defined as the rate of flow of charges, ie; the amount of charges flowing in 1 sec.